<template>
    <div class="cmt-container">
        <h3>
            发表评论
        </h3>
        <hr>
        <textarea placeholder="请输入要评论内容" maxlength="120" v-model="msg"></textarea>
        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>
        <div class="cmt-list">
            <div class="cmt-item" v-for="(item,i) in comments" :key="item.add_time">
                <div class="cmt-title"> 第{{i+1}}楼&nbsp;&nbsp;用户:{{ietm.user_name}}&nbsp;&nbsp;发表时间:{{item.add_time | dateFormat}}</div>
                <div class="cmt-body">
                    {{item.content==='undefined' ? '用户懒':item.content}}
                </div>
            </div>
          
        </div>

        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>

    </div>
</template>
<script>
import { Toast } from "mint-ui";
export default {
  data() {
    return {
      pageIndex: 1,
      comments: [],
      msg: ""
    };
  },
  created() {
    this.getComments();
  },
  methods: {
    //   获取评论
    getComments() {
      this.$http
        .get("api/getcomments/" + this.id + "?pageindex=" + this.pageIndex)
        .then(result => {
          if (result.body.status === 0) {
            // this.comments = result.body.message;
            // 当获取新数据的时候，不能清空覆盖， 而是新数据拼接上老数据
            this.comments = this.comments.concat(result.body.message);
          } else {
            Toast("获取评论失败");
          }
        });
    },
    getMore() {
      this.pageIndex++;
      this.getComments();
    },
    postComment() {
      // 校验是否为空
      if (this.msg.trim().length === 0) {
        return Toast("评论内容不能空");
      }

      //发表评论
      // 1.请求 url地址
      // 2 提交给服务器的数据对象(content:this.msg)
      //  3,定义提交的时候 表单中数据的格式 {emulateJSON:true}
      this.$http
        .post("api/postcomment/" + this.$route.props.id, {
          content: this.msg.trim()
        })
        .then(function(result) {
          if (result.body.status === 0) {
            var cmt = {
              user_name: "匿名用户",
              add_time: Date.now(),
              content: this.msg.trim()
            };
            this.comments.unshift(cmt);
            this.msg = "";
          }
        });
    }
  },
  props: ["id"]
};
</script>
<style lang="scss" scoped>
.cmt-container {
  h3 {
    font-size: 18px;
  }
  textarea {
    font-size: 14px;
    height: 85px;
    margin: 0;
  }
  .cmt-list {
    margin: 5px 0;
    .cmt-item {
      font-size: 13px;
      .cmt-title {
        line-height: 30px;
        background-color: #ccc;
      }
      .cmt-body {
        line-height: 35px;
        text-indent: 2em;
      }
    }
  }
}
</style>



